astronomR 0.3.0

New features

• Added a full thermal cosmology module with nine new exported functions covering the complete early-universe thermal history:

  • hubble_radiation() — Hubble rate H(T) in the radiation-dominated era via the Friedmann equation (natural units, GeV).
  • g_star_eff() — step-function approximation of effective relativistic degrees of freedom g★(T) across Standard Model epochs.
  • entropy_density() — entropy density s(T) = (2π²/45) g★_S T³.
  • equilibrium_number_density() — Maxwell-Boltzmann equilibrium number density n_eq(T).
  • equilibrium_yield() — equilibrium yield Y_eq(x) = n_eq / s using the modified Bessel function K₂.
  • boltzmann_pebble_rhs() — the Boltzmann relic-abundance pebble equation dY/dx governing WIMP thermal freeze-out.
  • solve_relic_abundance() — full ODE integration of the pebble equation (via deSolve) returning Y(x) and Ω h². Uses a log(Y) substitution to handle stiffness.
  • freeze_out_xf() — iterative solver for the freeze-out parameter x_f = m/T_f.
  • peebles_rhs() — Peebles equation for hydrogen recombination: returns dx_e/d(ln a), the Peebles C-factor, and the Lyman-alpha escape rate (SI units).

Minor changes

• DESCRIPTION updated to document the new thermal-cosmology and recombination capabilities; deSolve added to Suggests.
• NAMESPACE regenerated via devtools::document() to export all nine new functions.
• Version bumped to 0.3.0.

astronomR 0.2.0

New features

• Added drake_equation() — computes N, the estimated number of active, communicating civilisations in the Milky Way, from the seven classic Drake equation parameters (R_star, fp, ne, fl, fi, fc, L). Returns a named list with the numeric result, a substituted equation string, all input values, and a qualitative six-tier interpretation of N ranging from “effectively zero” (N < 0.001) to *“galaxy teeming with life” (N ≥ 10 000).

Minor changes

• DESCRIPTION updated to mention the Drake equation capability.
• Version bumped to 0.2.0.

astronomR 0.1.0

• Initial release of astronomR.
• Angular conversion functions: deg_to_dms(), dms_to_deg(), deg_to_hms(), hms_to_deg(), deg2rad(), rad2deg().
• Physical constants dataset constants_df and retrieval function constant_value().
• Gaia Archive query function get_gaia_data().
• Distance conversion functions km_to_Mpc() and Mpc_to_km().
• Early-universe thermal physics functions: photon_energy_density_fn_T(), photon_energy_density_fn_z(), photon_number_density_fn_T(), photon_number_density_fn_z(), Saha_Xe(), and soln_saha()